Cutter-head for suction-dredges.



' lo, 833,797. y PATBNTBD 00T. as, 1906.

- J. F. OLLRIGH.

GUTTER HEADFQR sUcTIoN DREDGBS.

APPLICATION FILED MALO, 1906.

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' GUTTER HEAD APPLIQATIO QR SUGTIUN 'N FILED maja. 1

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' ATTORNK APPLIGATION FILEDA HAB.. 8, 1908.

v fis/5 Nd. 833,797. PATENTED DGT. 23, 1906.

J. T. OLLRIGH.

GUTTER HEAD FoRsUCTIoN DR'rzDGfs. APPLICATION FILED MAR. 6, 1906. l

4' SHEETS-SHEET lllllllllllllllllllllllIlllll 10|A Q Illa isi AHORA/EK `citizen `of the United States, residing f -UNITED .,srArns PATENT mOIIFIOE. .i

JOHN F. OLLRIOH, OF sAN FRANCISCO, CALIFORNIA.

, Be it known that I, JOHN F. OLLRICH, a at San Francisco, in the county of San Francisco and State of California, have invented certain new and useful Improvements in Cutter-Heads for SuctiOn-'Dredges, of which the following is a specification. l

This invention relates to cutter-heads and teeth therefor for dredging-machines, the ob- 'ect of the invention bein to provide cuttereads and teeth which wi l be more effective than those heretofore employed and will also v be more durable and secure.

, is a perspective view of the tooth.

i tive view of a-"washer, all

In the accompanyingdrawings, Figure 1 is a side view of one form of my improved cutter-head. Fig. 2 is a broken end view of the same. Fig. 3 is an enlarged longitudinal section of one of the cutter-bars. Fig. 4 is a longitudinal section of one of' the teetlh. Fig. 5

igs. 6, 7, and 8 are views similar to Figs. 1, 2, and 3, respectively, of a modified construction. Fig. 9 is an end view of a bar. Fig. 10 is a perspective view of a tooth. Fig. 11 is a perspecin accordance with said modification. Fig. 12 is a perspective view of a bar, showing a modification of the teeth.l Figs. 13, 14, and 15 are views similar to Figsl, 2, and 3 of a further modification.

Fig. 16 is a longitudinal section of a tooth. perspective' View of a portion ofy Fig. 17 is a the head, showing a further modification. Fig. 18 is'a perspective view of said modified form of tooth. Fig. 19 is a perspective view of a further modification of the tooth. Figs.V

to Figs. 1, 2, and

20, 21, 22 are views similar 3 of a further modification. Fig. 23 is an end view of the bar. Fig. 24 is a sectional view. Fig. 25 is a4 front view showing a further modification.

Referring to the drawin shaft of thel cutter-hea having secured thereon 'the hub 2, from which radiate the arms or spokes 3, upon the ends of which are s, 1 represents the aformed the bars 4, all lying in a skew surface of revolution-that is, in planes oblique to that through the shaft-and also extending farthest outwardfrom the shaft at the end farthest from the hub 2. All of said outer ends are connected by a ring 5. holds all the parts rigidly together.

Upon each bar are formed tapering posts 6, upon which are firmly driven cuttin -teeth 7, having corresponding tapering soc ets 8 to fit upon said posts, The pressure of the ma- -end 19 of the This ring ,CUTTER-.HEAD FOR SUCTION-DREDGES.

Patented oct. 23, 190.6.

lterial which is being cut tends to force said teeth onto said posts and hold them firmly thereon. The bar is perforated, as shown at 9, to permit of a tool being inserted'through thebar behind the base 1()` of the tooth to drive it outward to release it from the b ar.

In the modification shown in Figs-6 to 12 the teeth are formed with hollow square bases 11, forming sleeves which are passed upon the bars, being alternated with s uare washers 12, the bars themselves eing formed square or oblong in cross-section. The s uare form of these bases prevents the teeth om turning on the bars, and the construction is such as to prevent the teeth falling off and being lost, as is fre uently the case with present forms of cutterheads. In Fig.. 12 the teeth are curved inward instead of outward, as in Figs. 6 to 11.

In the modification shown inFigs. 13 to 19 the bars are formed with undercut grooves 13, and the bases of the teeth have forks 14, which slide in said grooves and hold them in place. In the form shown in Figs. 18 and 19 the teeth are also formed with wearing-plates 15, which protect the bases of the teeth from wearing too fast.

In the modification shown in Figs. 20 to 25 the teeth are formed upon plates 16, which are securedby bolts 17 to the bars. This form is advantageous because it permits of the plates containing the teeth beingreadily removed and `replaced when worn, while at the same time protecting the bars from wear. In the modification shown in Fig. 25 two such plates 17 are provided for each bar, thus permitting of the plates being removed separately if one end is worn faster than the other. It will be observed that the lower or thicker plate'is beveled to rest against the ling 5 and receive the end thrust from the teet I do not claim herein the bases 10 or the plates 16, yformed integral with the teeth and protecting the bars from wear, as these fea-y tures form the subject of a separate application, filed August 21 1906, Serial No. 331,476; Inor do I claim herein the square bases or sleeves 11 or the forks 14, formed integral with the teeth andv protecting the sides ofthe bars from wear, as these features form the subject of a separate application, filed August 21, 1906, Serial No. 331,475. f

I claim- 1. A cutter-head comprising a shaft, a hub thereon, arms or spokes radiating from said IOO IIC

hub7 bars extending from the ends of said arms or spokes in planes oblique to that through the shaft, a ring connecting the other ends of said bars, and teeth carried by said bars, substantially as described.

2. A cutter-head comprising a shaft, a hub thereon, arms or spokes radiating from said hub, bars extending from the ends of said arms or spokes in planes oblique to that through the shaft, a ring connecting the other ends of said bars, and teeth carried by said bars, said teeth being provided With means for protecting the bars from Wear7 substantially as described.

3. A cutter-head comprising a shaft, a hub thereon, arms or spokes radiating from said hub, bars extending from the ends of said arms or spokes in planes oblique to that through the shaft, a ring connecting the other ends of said bars, teeth carried by said bars, said teeth beingI provided with means for protecting the bars from Wear, and means for removably securing said teeth upon said bars, substantially as described.

In -Witness whereof I have hereunto set my -hand in the presence of two subscribing Witn nesses.

JOHN F. OLLRICH.

Witnesses BEssIE GORFINKEL, ANNIE PETERsoN. 

